纳米纤维素晶体对超滤膜亲水性能的提升研究  

Effects of Cellulose Nanocrystals(CNCs)on membrane hydrophilicity enhancement

作　　者：白朗明 梁恒[1] 贾瑞宝 瞿芳术[1] 丁安[1] 李圭白[1] 

机构地区：[1]哈尔滨工业大学城市水资源与水环境国家重点实验室,哈尔滨150090 [2]山东省城市供排水水质监测中心,济南250021

出　　处：《给水排水》2016年第12期30-35,共6页Water & Wastewater Engineering

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07404-003);国家科技惠民工程(2013GS370202)

摘　　要：研究了纳米纤维素晶体(CNCs)对超滤膜亲水性能的影响,并考察了CNCs对纳米复合膜微观结构、亲疏水性及过滤性能的影响。结果表明:CNCs复合膜活性层孔隙结构增多;支撑层中膜孔以网状结构联通成整体。共混CNCs使纳米复合膜孔隙率从64%增加至77%;平均孔径从54nm增加至81nm。接触角从56.7°下降到48.1°,聚合力界面自由能(ΔG^(TOT))从-27.46mJ/m^2增加到12.46mJ/m^2,共混CNCs后超滤膜从疏水性表面转变为亲水性表面。相比聚醚矾(PES)对照膜,共混0.3%、0.6%和1.0%的CNCs,纯水通量分别提高25.6%、68.6%和196.7%;过滤BSA溶液后,比通量从0.681分别增加至0.777、0.819和0.915。This study focused on the effects of Cellulose Nanocrystals （CNCs） on membranes hydrophilicity enhancement. Pore structures, hydrophilicity and filtration performance of nanocom-posite membranes incorporated with CNCs were investigated. Results showed that porous structure of active layer of nanocomposite membranes were loosely packed by blending CNCs. In support lay- er, net-structure morphologies formed. Compared to the PES membrane, overall porosity increased from 64% to 77%and mean pore radius increased from 54 nm to 81 nm, respectively. Contact angle was decreased from 56.7° to 48. 1° as the increasing of CNCs content. Interfacial free energy of cohesion （△GTOT） was increased from -27.46 mJ/m2 to 12.46 mJ/m2, which indicated that hydrophobic membrane surface turned into hydrophilicity. Comparing with PES membrane, pure water flux of nanocomposite membranes was increased by 25.6%, 68. 6% and 196.7% by blending 0. 3%, 0. 6% and 1.0% content CNCs, respectively. BSA fouling test showed that normalized flux increased from 0. 681 to 0. 777, 0. 819 and 0. 915, respectively.

关 键 词：纳米纤维素晶体 超滤膜 亲水性 孔隙率 膜污染 

分 类 号：TQ633[化学工程—精细化工]